package com.imooc.threadpoolexecutor;

import java.util.concurrent.Callable;

/**
 * @author ChangLiang
 * @date 2019/3/6
 */
public class Thread02 implements Callable<String> {
    @Override
    public String call() throws Exception {
        StringBuilder sb = new StringBuilder();
        for(int i=0;i<4;i++){
            sb.append(i);
        }
        return sb.toString();
    }
}
